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Uranium-series dating of tephra-banded Allan Hills ice
https://doi.org/10.15094/00004495
https://doi.org/10.15094/00004495db93279c-62c2-4553-919c-20daab30553c
名前 / ファイル | ライセンス | アクション |
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Item type | 紀要論文(ELS) / Departmental Bulletin Paper(1) | |||||||
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公開日 | 1989-10-01 | |||||||
タイトル | ||||||||
タイトル | Uranium-series dating of tephra-banded Allan Hills ice | |||||||
言語 | ||||||||
言語 | eng | |||||||
資源タイプ | ||||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||||
資源タイプ | departmental bulletin paper | |||||||
ID登録 | ||||||||
ID登録 | 10.15094/00004495 | |||||||
ID登録タイプ | JaLC | |||||||
ページ属性 | ||||||||
内容記述タイプ | Other | |||||||
内容記述 | P(論文) | |||||||
著者名(英) |
Fireman, Edward L.
× Fireman, Edward L.
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著者所属(英) | ||||||||
en | ||||||||
Smithsonian Astrophysical Observatory | ||||||||
抄録(英) | ||||||||
内容記述タイプ | Other | |||||||
内容記述 | Tephra-banded ice samples from the main Allan Hills icefield, Antarctica, are dated by a uranium-series method, which is based on the ^<226>Ra/^<230>Th and ^<226>Ra/^<234>U ratios dissolved in ice from tephra. The consistence between the age determined from the ^<226>Ra/^<230>Th ratio with the age determined from the ^<226>Ra/^<234>U ratio serves as a check on the method. For ice from a location at the western border of the 50-km^2 area that is richly laden with meteorites, the ^<226>Ra/^<230>Th and ^<226>Ra/^<234>U ages are (95±10)×10^3 and (100±10)×10^3 years, respectively. For ice from a location within this meteorite-rich area near its eastern border (approximately 5km closer to the Allan Hills land barrier), these ages are (185±25)×10^3 and (210±30)×10^3 years, respectively. The ice flow is from west to east, the dates indicate that most of the ice in the meteorite-rich area is between 1×10^5 and 2×10^5 years old with the age of the ice increasing in the flow direction as theoretically predicted for ice approaching a land barrier. The comparison of this ice chronology with the terrestrial ages of the meteorites leads to a number of conclusions about the meteorite fall rate and history of the ice movement. | |||||||
雑誌書誌ID | ||||||||
収録物識別子タイプ | NCID | |||||||
収録物識別子 | AA10784627 | |||||||
書誌情報 |
Proceedings of the NIPR Symposium on Antarctic Meteorites 巻 2, p. 335-343, 発行日 1989-10 |
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出版者 | ||||||||
出版者 | National Institute of Polar Research |